I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... ( u' z/ }4 V. P2 I, C8 M$ }1 R3 b0 ^- |3 N- O( D
For me, I think car-pool is just to share part of gas "cost" and have some fun on road....." X0 j8 U" y0 x' e
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I usally charge passager 30 bucks for a trip.